rocketeers can't really get any appreciable number of kills unless they use alternative tactics, they only have 6 rounds (3 on realism) and they move slow as snakes in Siberia.
Provided that he can fire off 6 (or 3) shots without being riddles with just about every other gun in the game, he now has to jettison the 'zook' and find another weapon.
It's also not guaranteed that he'll hit anything at beyond 30 yards, considering that the rocket is slow (hard to NOT dodge at beyond 30 yards) and it goes erratic after about 75 yards.